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newly born, were as quick in their motions as the full grown 

 ones. 



In that part of thefe Animalcules which may be called the breaft, 

 • 1 faw a round particle moving with a reciprocal contrad;ion and di- 

 latation, in the time one might count one : this I did not doubt 

 was the heart. 



Moreover, the fore part of the bodies of thefe Animalcules, which 

 may be called the head, was divided into two parts, each of the two 

 divifions being of a round Ihape, fet round with certain long and very 

 llender organs, which, in their motion, exhibited a moll: pleating and 

 delightful fpedlacle ; to form an idea of which, we mull; fuppofe we 

 fee two Imall wheels fet round the edges with fliarp points or pins, 

 and thefe wheels in fwift motion, as it were, from the Weft towards 

 the South and Eaft, but never to move in a contrary dirediion 

 from the Weft towards the North and Eaft. 



This fpe6lacle appeared to me the more wonderfiil and incom- 

 prehenfible, becaufe it is not to be conceived how fuch a motion 

 can be produced or performed in an animal body. 



In order to give a clearer conception of this, I took a glafs tube 

 with fome of thefe Animalcules in rain water, which I placed before 

 the microfcope, and delivered the fame to the limner, that he might 

 make as exadl a drawing of it as he was able. 



Plate XVI. Jig. 33,ABCDEFG reprefents one of thefe Animal- 

 cules, which had fixed itlelf to the glafs by the help of the limbs or 

 organs at A. The round oblong particle, appearing between B and 

 G, I take to be a portion of its food nearly digefted ; that which is 

 fituated in the middle, I think is the food in theftomach and intef- 

 tines ; and the four oblong particles which feem, as it were, to fur- 

 round the inteftines, exhibit the young Animalcules in the body of 

 the parent. 



Between the letters D and E, appear the two round parts, fliaped 

 like wheels, with fliarp points placed upright on them. Thefe 



